Asus AM2 motherboard with 1000MHz FSB
AMD skt AM2 Athlon 5000+ at 2.6GHz with a x13 multiplier
Corsair DDR2 800 1GB (2 x 512MB) memory that should run at 4-4-4-12, model# TWIN2X1024-6400C4
Recommended reading:
Reset the bios to the default settings.
BIOS Menu Options
Main ....
Advanced ....
Power ....
Boot ....
Exit
Advanced:
- CPU Configuration
- PCIPnP
- Onboard Device Configuration
- Jumperfree Configuration
- LAN Cable Status
- PEG Link Mode
CPU Configuration:
- DRAM Configuration
- Hypertransport Frequency
- AMD K8 Cool 'n' Quiet Control
DRAM Configuration:
- Timing Mode
- Memclock index value (Mhz)
- CAS# latency (Tcl)
- Min RAS# active time (Tras)
- RAS# to CAS# delay (Trcd)
- Row precharge Time (Trp)
- Row cycle time (Trc)
- Row refresh cyc time (Trfc)
- Read-to-Write time (Trast)
- Write Recovery time (Twr)
- 1T/2T Memory Timing
- S/W DRAM Over 4G Remapping
- H/W DRAM Over 4G Remapping
JumperFree Configuration:
- Overclock Profile
- Overclock Options
- N.O.S. Option
- CPU Frequency
- PCI Express Clock
- DDR Voltage
- CPU Multiplier
- CPU Voltage
- PCI Clock Synchronization Mode
The processor communicates with the memory through a bus, called the HTT or FSB (bus). The default setting is 200MHz and this can be overclocked, in increments of 2-3MHz, up to 300 or 320MHz. Adjusting this bus speed on the motherboard affects the processor speed and the memory speed. The memory cannot be set as high as the processor can. Your DDR2 800 memory may need a ratio setting (divider) to operate at a slower speed than the processor and still allow the two to communicate with each other. I am not certain what the maximum MHz speed your memory can handle since I do not have an AM2 system with DDR2 memory. So I cannot properly recommend a maximum DDR2 setting with an appropriate divider. I will need to read more of the articles and related posts to figure this out.
The x13 multiplier of your cpu will not require a large adjustment in the bus speed. With only a small bus speed adjustment, it is possible the memory can operate at its 1:1 setting without the need for a divider.
Set your Hypertransport Frequency to (4x).
Your memory timings are 4-4-4-12, corresponding to CL-tRCD-tRP-tRAS. Therefore, set the following settings.
DRAM Configuration:
- Timing Mode [Manual]
- Memclock index value (Mhz) [400] (I believe 400MHz is the appropriate setting for DDR2 memory but I am not certain. For DDR 400 memory, the 400MHz is appropriate. Your settings may be different from mine here.)
- CAS# latency (Tcl) [4]
- Min RAS# active time (Tras) [12]
- RAS# to CAS# delay (Trcd) [4]
- Row precharge Time (Trp) [4]
- Row cycle time (Trc)
- Row refresh cyc time (Trfc)
- Read-to-Write time (Trast)
- Write Recovery time (Twr)
- 1T/2T Memory Timing [1T] is probably best
- S/W DRAM Over 4G Remapping
- H/W DRAM Over 4G Remapping
JumperFree Configuration:
- Overclock Profile [Manual]
- Overclock Options
- N.O.S. Option
- CPU Frequency [200, 202, 204, 206, ...]
- PCI Express Clock
- DDR Voltage
- CPU Multiplier [x13]
- CPU Voltage
- PCI Clock Synchronization Mode
Adjust the CPU Frequency up in 2 or 3 MHz increments. After each setting increase, reboot the system and check for stability. Depending on how you check stability, this part can take an hour to a week of time.
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